Elgin County OPP are investigating a fatal collision on the westbound 401 just east of Union Road in London.
Police were called to the scene at around 12:31 a.m., where two tractor trailers were involved in a collision.
Police are investigating the incident and determined that a tractor trailer travelling eastbound on the 401 crossed the centre median, rolled over, and collided with another tractor trailer travelling westbound on the 401.
OPP say 66-year-old Gary Lent of Etobicoke was pronounced dead on scene, and another man is in the hospital with serious injuries.
Westbound lanes on the 401 were closed for most of the day as OPP Technical Traffic Collision Investigators were on scene.
If you are traveling west of London, all WB 401 lanes are closed at Union for a crash investigation. Detour: Union to Talbot to Iona.
— 570 Traffic (@570traffic) February 16, 2017
OPP say they continue to investigate the crash.